<!DOCTYPE html>
<html lang="en">
<head>
    <meta charset="UTF-8">
    <title>Title</title>
</head>
<body>
<div align="center">
    <h1>主页</h1>
    <p>欢迎用户{{name}}</p>
    <form method="POST">
        <p>修改用户名:<input type="text" name="username"></p>
        <p><input type="submit" value="修改"></p>
    </form>
</div>
</body>
</html>